851
FNCA52 TJSJ 090730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SUN AUG 9 2026
DISCUSSION
THE FIRE WEATHER THREAT IS EXPECTED TO REMAIN LOW TODAY AS
MOISTURE INCREASES TO AROUND 50 AND 60 PERCENT ACROSS SOUTHERN
PUERTO RICO DUE TO THE PASSAGES OF A TROPICAL WAVE LOCATED OVER
THE CARIBBEAN WATERS. HOWEVER, ONGOING DROUGHT CONDITIONS, FIRES
CAN STILL START AND SPREAD, ESPECIALLY WITH THE INCREASED WINDS
AROUND 15 TO 20 MPH AT TIMES. RESIDENTS AND VISITORS SHOULD
CONTINUE TO AVOID ACTIVITIES THAT COULD CREATE SPARKS OR FLAMES
NEAR DRY VEGETATION, AND NEVER LEAVE AN IGNITION SOURCE
UNATTENDED.
WE ENCOURAGE EVERYONE TO CONTINUE TO MONITOR THE FORECAST FOR ANY
CHANGES IN THE FIRE WEATHER THREAT THROUGHT THE DAY.
PRZ014-092000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10
TEMP (24H TREND) 91 (0) 75 (-3) 93
RH % (24H TREND) 48 (-3) 87 (+5) 45
WIND 20FT/EARLY(MPH) E 21 E 14 E 18
WIND 20FT/LATE(MPH) E 23 E 12 E 18
MIXING HGT(FT-AGL/MSL)5870 5950
TRANSPORT WND (MPH) E 25 E 23
VENT RATE (KT-FT) 129140 119000
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-092000-
SOUTHERN HILLS-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 89 (+2) 72 (-3) 91
RH % (24H TREND) 61 (+2) 98 (+9) 56
WIND 20FT/EARLY(MPH) E 17 E 13 E 14
WIND 20FT/LATE(MPH) E 17 E 13 E 16
MIXING HGT(FT-AGL/MSL)6150 6270
TRANSPORT WND (MPH) E 24 E 22
VENT RATE (KT-FT) 129150 119130
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-092000-
NORTH COASTAL PLAINS-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 30
TEMP (24H TREND) 91 (+1) 75 (-3) 92
RH % (24H TREND) 63 (-1) 98 (+9) 61
WIND 20FT/EARLY(MPH) E 19 E 19 E 17
WIND 20FT/LATE(MPH) E 21 E 12 E 23
MIXING HGT(FT-AGL/MSL)5370 6050
TRANSPORT WND (MPH) E 25 E 23
VENT RATE (KT-FT) 118140 121000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-092000-
NORTHERN HILLS-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 0 40
TEMP (24H TREND) 89 (+1) 73 (-2) 92
RH % (24H TREND) 67 (+3) 99 (+5) 62
WIND 20FT/EARLY(MPH) E 17 E 18 E 16
WIND 20FT/LATE(MPH) NE 19 E 10 E 20
MIXING HGT(FT-AGL/MSL)5530 6430
TRANSPORT WND (MPH) E 23 E 20
VENT RATE (KT-FT) 110600 109310
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-092000-
WEST COAST-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY CLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 50 0 60
TEMP (24H TREND) 92 (+1) 73 (-2) 93
RH % (24H TREND) 63 (+1) 98 (+5) 60
WIND 20FT/EARLY(MPH) E 17 E 18 E 14
WIND 20FT/LATE(MPH) E 19 E 13 E 17
MIXING HGT(FT-AGL/MSL)5010 5680
TRANSPORT WND (MPH) E 17 E 15
VENT RATE (KT-FT) 75150 73840
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-092000-
EASTERN INTERIOR-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20
TEMP (24H TREND) 90 (+1) 73 (-4) 91
RH % (24H TREND) 62 (+1) 99 (+10) 58
WIND 20FT/EARLY(MPH) E 14 E 13 E 13
WIND 20FT/LATE(MPH) E 14 E 12 E 14
MIXING HGT(FT-AGL/MSL)6530 6480
TRANSPORT WND (MPH) E 23 E 22
VENT RATE (KT-FT) 130600 123120
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-092000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20
TEMP (24H TREND) 85 (+2) 71 (-3) 86
RH % (24H TREND) 69 (-3) 100 (+6) 67
WIND 20FT/EARLY(MPH) E 13 E 11 E 12
WIND 20FT/LATE(MPH) E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL)5430 5860
TRANSPORT WND (MPH) E 23 E 23
VENT RATE (KT-FT) 108600 117200
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-092000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY CLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 60 0 40
TEMP (24H TREND) 87 (+3) 70 (-2) 88
RH % (24H TREND) 70 (+5) 99 (+5) 63
WIND 20FT/EARLY(MPH) E 12 E 16 E 11
WIND 20FT/LATE(MPH) E 16 E 9 E 12
MIXING HGT(FT-AGL/MSL)6490 7730
TRANSPORT WND (MPH) E 21 E 15
VENT RATE (KT-FT) 116820 100490
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-092000-
CAYEY MOUNTAIN RANGE-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 85 (+1) 72 (-2) 86
RH % (24H TREND) 70 (+4) 100 (+6) 65
WIND 20FT/EARLY(MPH) E 16 E 11 E 13
WIND 20FT/LATE(MPH) E 16 E 11 E 13
MIXING HGT(FT-AGL/MSL)5860 5960
TRANSPORT WND (MPH) E 25 E 24
VENT RATE (KT-FT) 128920 125160
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-092000-
VIEQUES-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20
TEMP (24H TREND) 91 (+1) 80 (0) 91
RH % (24H TREND) 58 (-3) 88 (+4) 57
WIND 20FT/EARLY(MPH) E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 16 E 14
MIXING HGT(FT-AGL/MSL)3040 4680
TRANSPORT WND (MPH) E 24 E 24
VENT RATE (KT-FT) 63840 98280
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-092000-
CULEBRA-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 20
TEMP (24H TREND) 91 (+2) 79 (0) 91
RH % (24H TREND) 62 (-5) 93 (+4) 62
WIND 20FT/EARLY(MPH) E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 16 E 14
MIXING HGT(FT-AGL/MSL)3090 4650
TRANSPORT WND (MPH) E 24 E 24
VENT RATE (KT-FT) 64890 97650
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-092000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS NONE SHOWERS
CHANCE PRECIP (%) 30 0 20
TEMP (24H TREND) 92 (+1) 75 (-1) 92
RH % (24H TREND) 50 (-4) 86 (0) 48
WIND 20FT/EARLY(MPH) E 21 E 23 E 20
WIND 20FT/LATE(MPH) E 25 G33 E 14 SE 23
MIXING HGT(FT-AGL/MSL)5600 5730
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 106400 114600
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-092000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10
TEMP (24H TREND) 90 (+3) 78 (+1) 89
RH % (24H TREND) 62 (-5) 92 (-2) 62
WIND 20FT/EARLY(MPH) E 18 E 18 E 16
WIND 20FT/LATE(MPH) E 17 E 17 E 14
MIXING HGT(FT-AGL/MSL)2720 3700
TRANSPORT WND (MPH) E 25 E 24
VENT RATE (KT-FT) 59840 77700
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-092000-
ST CROIX-
330 AM AST SUN AUG 9 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 10
TEMP (24H TREND) 90 (+2) 78 (-2) 90
RH % (24H TREND) 64 (-3) 91 (+1) 63
WIND 20FT/EARLY(MPH) E 17 E 17 E 14
WIND 20FT/LATE(MPH) E 17 E 17 E 14
MIXING HGT(FT-AGL/MSL)5130 5960
TRANSPORT WND (MPH) E 25 E 22
VENT RATE (KT-FT) 112860 113240
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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